Home won't cool -- Not enough air flow - http://www.hvacmechanic.com/ Forums
Original message
| ronreb
 |  "Home won't cool -- Not enough air flow"
, posted Tue 22 Jul 21:58  
I will start by saying I am not a HVAC expert - in fact, quite the opposite.
We live in a home (ranch on a finished basement) that's about 25 years old. When the home was built originally, one end of the house was on a thermostat upstairs, the other end of the house was on a separate thermostat located towards the other end of the house upstairs.
Last year, it was suggested to me to reduce energy costs, we move one thermostat to the basement, and therefore not heat/cool the basement as much as the upstairs. Sounded like a good idea at the time.
I had my uncle come move the thermostat to the basement and I proceded to re-arrange all the duct work to make this possible.
We have a pretty large unit that runs the upstairs (I am not sure of the tonage) and a smaller unit that runs the basement. Since we have a pretty long run from the big unit to the other end of the house, my uncle suggested I make the main run 12" to accommodate for such a long run with multiple registers, then I split off to 10" X8"X8" "Y"'s + flex to the registers. The run from the unit to the kitchen is about 40 feet.
What I discovered after all this is that we now have extremely poor airflow in the den and kitchen next door. With summer heating up, it will no longer cool the far end of the house and temps in the kitchen and living room have been about 81 degrees. Back of the house (immediately above unit) cools fine, and air temp coming out of all registers has been about 59 degrees with outside temps about 95 here lately. Thermostat is in middle of house in den, and consistently reads at least 77 or above.
I added a booster fan on the line coming to register in den, and it did absolutely nothing to help air flow - Nothing! I took it out.
I have now removed the 12" and reduced to 10" and there is a little bit of improvement, but not much. Above temps are after switch to 10" main run.
IS this enough info to make any suggestions? ANY help would be greatly appreciated - we're melting and electric bill is $475+!!!!
Thanks,
Ron
ronreb
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Replies:
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| hollywood
| "Re(1):Home won't cool -- Not enough air flow" , posted Wed 23 Jul 16:24:
Where is this run coming off of the main supply plenum?
[this message was edited by hollywood on Wed 23 Jul 16:25] |
| Houston204
| "Re(1):Home won't cool -- Not enough air flow" , posted Wed 23 Jul 00:37
You are going to need a contractor inspecting your ducts to correct this issue.
"Tip of the Day" Remember to remove power first.
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